2015/03/18 by Adam Balcerzak · 11 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmological constant #Cosmology and Gravitation Theories #Curvature #Gravitation #Gravitational constant #Initial singularity #Noncommutative and Quantum Gravity Theories #Quantum cosmology #Quantum gravity #Singularity #Universe #astro-ph.CO #gr-qc #hep-th
paper · pdf · doi:10.1088/1475-7516/2015/04/019
published in Journal of Cosmology and Astroparticle Physics 2015(04), 019 (Institute of Physics) · 8 pages, 1 figure, references added
arxiv created 2015/03/18 · openalex publication_date 2015/04/15 · arxiv updated 2015/04/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We consider gravity theory with varying speed of light and varying gravitational constant. Both constants are represented by non-minimally coupled scalar fields. We examine the cosmological evolution in the near curvature singularity regime. We find that at the curvature singularity the speed of light goes to infinity while the gravitational constant vanishes. This corresponds to the Newton's Mechanics limit represented by one of the vertex of the Bronshtein-Zelmanov-Okun cube [1,2]. The cosmological evolution includes both the pre-big-bang and post-big-bang phases separated by the curvature singularity. We also investigate the quantum counterpart of the considered theory and find the probability of transition of the universe from the collapsing pre-big-bang phase to the expanding post-big-bang phase.